package com.kx.yooli.kx.wechat.utils.wx;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

/**
 * @author john_sqwen-childe.wen
 * date 2024/6/4
 * PROJECT_NAME wechat
 * description create WeiXinUtils by john_sqwen
 * and  value is
 */
public class WeiXinUtils {
    private static final Logger log = LoggerFactory.getLogger(WeiXinUtils.class);
    /**

     * 验证签名

     *

     * @param signature

     * @param timestamp

     * @param nonce
     *
      * @param token

     * @return

     */

    public static boolean checkSignature(String signature, String timestamp, String nonce,String token) {

        String[] arr = new String[] { token, timestamp, nonce };

        // 将token、timestamp、nonce三个参数进行字典序排序
        Arrays.sort(arr);
        log.info("token arr 参数"+arr);
        StringBuilder content = new StringBuilder();

        for (int i = 0; i < arr.length; i++) {
            content.append(arr[i]);
        }
        MessageDigest md = null;
        String tmpStr = null;
        try {
            md = MessageDigest.getInstance("SHA-1");
            // 将三个参数字符串拼接成一个字符串进行sha1加密
            byte[] digest = md.digest(content.toString().getBytes());
            tmpStr = byteToStr(digest);
        } catch (NoSuchAlgorithmException e) {
            log.info("the method not found please check it ");
            e.printStackTrace();
        }
        content = null;
        log.info("经过加密后的signature为："+tmpStr+" 微信服务器的signature为:"+signature.toUpperCase());
        // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
        return tmpStr != null && tmpStr.equals(signature.toUpperCase());

    }

    /**

     * 将字节数组转换为十六进制字符串

     *

     * @param byteArray

     * @return

     */

    private static String byteToStr(byte[] byteArray) {

        String strDigest = "";

        for (int i = 0; i < byteArray.length; i++) {

            strDigest += byteToHexStr(byteArray[i]);

        }

        return strDigest;

    }

    /**

     * 将字节转换为十六进制字符串

     *

     * @param mByte

     * @return

     */

    private static String byteToHexStr(byte mByte) {

        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

        char[] tempArr = new char[2];

        tempArr[0] = Digit[(mByte >>> 4) & 0X0F];

        tempArr[1] = Digit[mByte & 0X0F];

        String s = new String(tempArr);

        return s;

    }
}
